By Caitlin Yilek Politics Reporter Caitlin Yilek is a politics reporter at CBSNews.com, based in Washington, D.C. She previously worked for the Washington Examiner and The Hill, and was a member of the 2022 Paul Miller Washington Reporting Fellowship with the National Press Foundation. Read Full Bio Updated on: April 30, 2026 / 10:50 PM EDT / CBS News Add CBS News on Google Washington — President Trump faces a key deadline in the war with Iran on Friday under a decades-old law that limits the use of force without authorization from Congress. The War Powers Resolution of 1973 lays out a timeline for when lawmakers must be notified of hostilities and when a president is required to withdraw American forces from a conflict in the absence of congressional authorization.  Under the law, the president is required to give formal notification to Congress within 48 hours of introducing American forces into hostilities, which officially begins a 60-day clock for the president to terminate the use of force unless…